维持蛋白质二级结构的主要化学键是()。A.盐键 B.疏水键 C.二硫键 D.氢键 E

题型:单项选择题

问题:

维持蛋白质二级结构的主要化学键是()。

A.盐键

B.疏水键

C.二硫键

D.氢键

E.范德华力

考点:化学工程生物化学生物化学题库
题型:单项选择题

35岁,结婚10年,孕4产0,人流3次,孕32周, * * 少量出血3天,不伴腹痛。体检:儿头高浮,胎心140次/分,耻骨联合上方可闻及胎盘杂音

诊断此病需做的检查()

A.B超

B.腹部CT

C.消毒内诊

D.血尿常规

E.心电图

题型:单项选择题

引起头痛的颅外病变有()。

A.颅骨肿瘤

B.偏头痛

C.肺炎

D.脑炎

E.脑膜炎

题型:单项选择题

The Channel is the name given to the stretch of water which separates England and France. Ferries operate all year round to carry people across the Channel, and they are busy most of the year. January is the only quiet month nowadays. As well as summer holiday-makers, there are day trippers and coach traffic, not to mention lorries and other commercial vehicles. Some ferries carry cars and their passengers, while others also connect train passengers with the Continental rail network.

The biggest hazard for the ferry is the wind. The crew listens to BBC weather reports four times a day. Or they sometimes get gale warnings from local radio station.

Crossing the Channel by ferry is a bit like trying to cross Oxford Street on a busy afternoon, according to one ferryboat captain. The ferries from Folkstone and Dover to Calais and Boulogne have to cross the main flow of traffic. This consists of ships traveling through the Channel to and from Northern Europe. There may be four hundred ships making the journey at any one time, and they all pass through a “choke point” which is only fifteen miles (twenty-five kilometers) wide. The cross-channel ferries have to sail right through the middle of all this traffic.

68. The passage is mainly concerned with _____.

A. the English Channel                              B. the weather on the Channel

C. cross-channel ferries                              D. what crossing the Channel by ferry is like

69. The word hazard is closest in meaning to ________.

A. trouble                            B. danger                     C. enemy               D. problem

70. We can infer from the passage that _______.

A. if there is a gale warning from the BBC, the ferries will stop operating.

B. the traffic on the Channel is very busy only in winter

C. ferries are busiest in the afternoon

D. the crew of the ferry listens to the weather reports four times a day

71. Where does this passage most probably appear?

A. In a dictionary.                                     B. In a novel.

C. In a transportation magazine.                  D. In a geography textbook.

题型:单项选择题

桥梁施工控制时,应用现代控制理论中的纠偏终点控制法,对桥梁结构的主要基本设计参数进行识别,发现实测值与预计值的偏差,进行参数修正,达到()目的。

A.控制

B.单控

C.双控

D.设计

题型:单项选择题

贷款30万元,贷款利率6%,期限20年,按月本利平均摊还,那么第183期应该偿还的本金为( ),该期本金还款后贷款余额为( )。

A.1609元,106370元
B.1609元,104752元
C.1617元,104752元
D.1630元,114502元

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